US8704796B2 - Touch panel and display device - Google Patents
Touch panel and display device Download PDFInfo
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- US8704796B2 US8704796B2 US13/091,422 US201113091422A US8704796B2 US 8704796 B2 US8704796 B2 US 8704796B2 US 201113091422 A US201113091422 A US 201113091422A US 8704796 B2 US8704796 B2 US 8704796B2
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
Definitions
- the present invention relates to a touch panel and a display device, and more particularly to a technique which is effectively applicable in narrowing a width of a picture frame region outside an effective touch region.
- a display device which is provided with a device for inputting information with a touch operation using a finger of a user or a pen (contact pushing operation, hereinafter simply referred to as “touch”) on a display screen (hereinafter also referred to as a touch sensor or a touch panel) is used in a mobile electronic device such as a PDA or a portable terminal, various household appliances, an automated teller machine and the like.
- a touch panel As such a touch panel, a resistance-film type touch panel in which a change in a resistance value of a touched portion is detected, an electrostatic-capacitance type touch panel in which a change in capacitance is detected, an optical-sensor type touch panel in which a change in quantity of light is detected and the like are known.
- the electrostatic-capacitance type touch panel has the following advantages compared with the resistance-film type touch panel and the optical-sensor type touch panel.
- the electrostatic-capacitance type touch panel is advantageous with respect to a point that transmissivity is high, that is, approximately 90% thus preventing the lowering of quality of a display image compared to the resistance-film type touch panel and the optical-sensor type touch panel where transmissivity is low, that is, approximately 80%.
- the resistance-film type touch panel detects a touch position in response to a mechanical contact with a resistance film and hence, there exists a possibility that the resistance film is deteriorated or broken, there is no mechanical contact which brings an electrode for detection into contact with other electrode or the like in the electrostatic-capacitance type touch panel and hence, the electrostatic-capacitance type touch panel is advantageous also from a viewpoint of durability.
- the touch panel As the electrostatic-capacitance type touch panel, for example, there has been known a touch panel of this type disclosed in JP 2008-310550 A.
- the touch panel is provided with electrodes arranged in the longitudinal direction for detection (hereinafter referred to as X electrodes) and electrodes arranged in the lateral direction for detection (hereinafter referred to as Y electrodes) which are arranged in a matrix array in two dimensional directions consisting of the longitudinal direction and the lateral direction, and an input processing part which detects a capacitance of each electrode.
- the input processing part detects the increase of the capacitance, and calculates input coordinates based on a signal indicative of a change in capacitance detected by each electrode.
- an inspection pad is arranged on the other side of the Y electrode.
- this touch panel of one-sided feeding type to make a width of a picture frame outside an effective touch region uniform on left and right sides and to minimize the width, it is desirable to lead out the lead lines alternately.
- the lead lines are arranged in a region more outside the inspection pad.
- the width of the picture frame is increased.
- the omission of the inspection pads for narrowing the picture frame gives rise to a drawback that the disconnection of the Y electrode or the lead line of the Y electrode cannot be inspected.
- the present invention has been made to overcome the above-mentioned problems of the related art, and it is an object of the present invention to provide a technique which can narrow a width of a picture frame outside an effective touch region in a touch panel where inspection pads are arranged on the other side of electrodes for detection and electricity is supplied to the electrodes for detection from one side of the electrodes for detection.
- an electrostatic capacitance type touch panel which includes: a substrate; a plurality of X electrodes which are formed over the substrate, the plurality of X electrodes extending in a second direction and being arranged in a first direction which intersects with the second direction; and a plurality of Y electrodes which are formed over the substrate, the plurality of Y electrodes extending in the first direction while intersecting with the X electrodes and being arranged in the second direction; a drive voltage being supplied to the plurality of Y electrodes from one side of the plurality of Y electrodes, wherein lead lines are alternately connected to one end portions of the plurality of Y electrodes respectively, the respective lead lines are formed outside an effective touch region, and are connected to terminals which are formed on one side of the substrate and are formed corresponding to the respective lead lines, inspection pads which are connected with the Y electrodes respectively are formed at end portions of the respective Y electrodes on a side where the lead lines are not connected to the respective Y
- an electrostatic capacitance type touch panel which includes: a substrate, a plurality of X electrodes which are formed over the substrate, the plurality of X electrodes extending in a second direction and being arranged in a first direction which intersects with the second direction; and a plurality of Y electrodes which are formed over the substrate, the plurality of Y electrodes extending in the first direction while intersecting with the X electrodes and being arranged in the second direction; a drive voltage being supplied to the plurality of Y electrodes from one side of the plurality of Y electrodes, wherein lead lines are alternately connected to one end portions of the plurality of Y electrodes respectively, the respective lead lines are formed outside an effective touch region, and are connected to terminals which are formed on one side of the substrate and are formed corresponding to the respective lead lines, a plurality of inspection-use lead lines which are connected with the Y electrodes respectively are formed at end portions of the respective Y electrodes on a side where the lead lines
- a width of a picture frame outside an effective touch region can be narrowed.
- FIG. 1 is a view for explaining a touch panel according to an embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line II-II in FIG. 1 ;
- FIG. 3 is a view for explaining a touch panel according to an embodiment 2 of the present invention.
- FIG. 4 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line IV-IV in FIG. 3 ;
- FIG. 5 is a view for explaining a touch panel according to a modification of the embodiment 1 and the embodiment 2 of the present invention.
- FIG. 6 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line VI-VI in FIG. 5 ;
- FIG. 7 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line VII-VII in FIG. 5 ;
- FIG. 8 is a view for explaining an X electrode of a touch panel according to an embodiment 3 of the present invention.
- FIG. 9 is a view for explaining an X electrode of a touch panel according to an embodiment 4 of the present invention.
- FIG. 10 is a view for explaining a drawback of the touch panel according to the embodiment 3 of the present invention.
- FIG. 11 is a view for explaining an X electrode of a touch panel according to an embodiment 5 of the present invention.
- FIG. 12 is a view for explaining lead lines of a touch panel according to an embodiment 6 of the present invention.
- FIG. 1 is a view for explaining a touch panel according to the embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line II-II in FIG. 1 .
- the touch panel of this embodiment includes a plurality of X electrodes (X 1 to X 5 ) which extend in a second direction (Y direction) and are arranged parallel to each other in a first direction (X direction) which intersects with the second direction at a predetermined arrangement pitch, and a plurality of Y electrodes (Y 1 to Y 6 ) which extend in the first direction intersecting with the X electrodes and are arranged parallel to each other in the second direction at a predetermined arrangement pitch.
- a portion indicated by a dotted frame in FIG. 1 indicates an effective touch region.
- Each one of the plurality of X electrodes has an electrode pattern in which a fine line portion 1 a and a pad portion 1 b having a width larger than a width of the fine line portion 1 a are arranged alternately in the second direction.
- the plurality of X electrodes are arranged on an insulation film 12 , and are covered with a protective film 13 which is formed over the plurality of X electrodes.
- Each Y electrode has an electrode pattern in which a fine line portion 2 a and a pad portion 2 b having a width larger than a width of the fine line portion 2 a are arranged alternately in the first direction.
- the pad portion 1 b of each X electrode and the pad portion 2 b of each Y electrode are arranged without overlapping with each other, and the fine line portion 1 a of each X electrode and the fine line portion 2 a of each Y electrode intersect with each other.
- the respective fine line portions 2 a of the plurality of Y electrodes are formed over a layer different from a layer over which the fine line portions 1 a and the pad portions 1 b of the X electrodes are formed, and the fine line portions 2 a of the Y electrodes intersect with the fine line portions 1 a of the X electrodes as viewed in a plan view.
- the respective pad portions 2 b of the plurality of Y electrodes are formed over the same layer as the fine line portions 1 a and the pad portions 1 b of the X electrodes in a separated manner from the pad portions 1 b of the X electrodes.
- the fine line portions 1 a of the X electrodes are formed above the fine line portions 2 a of the Y electrodes.
- the respective pad portions 2 b of the plurality of Y electrodes are covered with the protective film 13 .
- Each one of the fine line portions 2 a of the Y electrodes is formed over a substrate 11 , and the fine line portion 2 a of the Y electrode is electrically connected with two pad portions 2 b arranged adjacent to each other with the fine line portion 2 a sandwiched therebetween via a contact hole 12 a formed in the insulation film 12 .
- the X electrodes and the Y electrodes are formed using a material which possesses high transmissivity, for example, a transparent conductive material such as ITO (Indium Tin Oxide), for example.
- the touch panel of this embodiment is also a touch panel of a one-sided feeding type.
- the X electrodes are constituted of five X electrodes X 1 to X 5 , the respective X electrodes are connected to lead lines (LX 1 to LX 5 ), and the lead lines (LX 1 to LX 5 ) are connected to respective terminal portions (TX 1 to TX 5 ) formed on one side of the substrate 11 .
- the Y electrodes are constituted of six Y electrodes Y 1 to Y 6 , one-end portions of the respective Y electrodes are connected to lead lines (LY 1 to LY 6 ), and the lead lines (LY 1 to LY 6 ) are connected to respective terminal portions (TY 1 to TY 6 ) formed on one side of the substrate 11 .
- the lead lines (LY 1 to LY 6 ) of the Y electrodes are led out alternately to left and right sides. Further, the other end portions of the Y electrodes are respectively connected to inspection pads (PY 1 to PY 6 ) for inspecting an electrical conduction.
- the lead lines (LX 1 to LX 5 , LY 1 to LY 6 ) are formed in a region outside the effective touch region (region indicated by an arrow A in FIG. 2 ), and are formed of a metal layer such as a silver alloy film.
- the inspection pads (PY 1 to PY 6 ) are arranged over the lead lines (LY 1 to LY 6 ) of the Y electrodes which are led out alternately on the left and right sides.
- the inspection pad PY 1 is arranged over the lead lines LY 2 , LY 4 and LY 6 .
- An active shield electrode (ASC) is arranged between the inspection pads (PY 1 to PY 6 ) and the lead lines (LY 1 to LY 6 ) of the Y electrodes.
- this embodiment adopts the structure where the active shield electrode (ASC) is sandwiched between the inspection pads (PY 1 to PY 6 ) and the lead lines (LY 1 to LY 6 ) of the Y electrodes.
- the inspection pads are formed over the same layer over which the fine line portions 1 a and the pad portions 1 b of the X electrodes and the pad portions 2 b of the Y electrodes are formed, and the inspection pads (PY 1 to PY 6 ) are formed of a transparent conductive film such as ITO in the same manner as the X electrodes and the Y electrodes. Due to such a constitution, it is unnecessary to perform film forming or working to newly form inspection pads.
- the touch panel to allow the detection of a change in capacitance of each electrode in response to a finger touch, it is necessary that the X electrodes and the Y electrodes are surely connected to the terminal portions formed on one side of the substrate by the respective lead lines. When a disconnection exists on any of the electrodes or in the midst of any of the lead lines, the detection of the change in capacitance in response to the finger touch cannot be detected.
- a touch panel in which a disconnection is found in the midst of the connection can be eliminated as a defective product thus realizing a touch panel which exhibits a high yield at the time of manufacturing.
- a voltage equal to a drive voltage supplied to the Y electrodes (Y 1 to Y 6 ) is supplied to the active shield electrode (ASC). Accordingly, capacitive coupling between the inspection pads (PY 1 to PY 6 ) and the lead lines (LY 1 to LY 6 ) of the Y electrodes can be suppressed thus suppressing the capacitive coupling between the Y electrodes. As a result, a touch panel which exhibits high accuracy in position determination can be realized in the same manner.
- the inspection pad (PY 5 ) which is arranged on the other end of the Y electrode Y 5 is arranged over the lead line (LY 6 ) of the Y electrode Y 6
- the active shield electrode (ASC) is arranged between the lead line (LY 6 ) and the inspection pad (PY 5 ) and hence, crosstalk generated due to the capacitive coupling between the Y electrode Y 5 and the Y electrode Y 6 can be suppressed.
- the active shield electrode (ASC) is arranged between the lead lines (LY 1 to LY 6 ) and the inspection pads (PY 1 to PY 6 ) and hence, crosstalk generated due to the capacitive coupling between the lead lines (LY 1 to LY 6 ) of the respective Y electrodes and other Y electrodes can be suppressed.
- a touch panel controller detects this change in capacitance, and determines that the finger touch is made on the Y electrode Y 6 .
- the touch panel controller detects that capacitance over the Y electrode Y 5 is slightly changed. Accordingly, the touch panel controller erroneously determines that the finger touch is made between the Y electrode Y 5 and the Y electrode Y 6 .
- the touch panel controller determines a position deviated from a position at which the finger touch is originally made and hence, the accuracy in position determination is deteriorated.
- the active shield electrode (ASC) is sandwiched between the inspection pads (PY 1 to PY 6 ) and the lead lines (LY 1 to LY 6 ) of the Y electrodes, the above-mentioned crosstalk can be suppressed thus realizing a touch panel which exhibits high accuracy in position determination.
- the inspection pads (PY 1 to PY 6 ) are arranged on the originally necessary lead lines (LY 1 to LY 6 ) and hence, it is unnecessary to expand a picture frame region for the inspection pads (PY 1 to PY 6 ) whereby a touch panel with high design property can be realized.
- the active shield electrode (ASC) can be formed in the same step where the fine line portions 2 a of the Y electrodes which constitute intersecting portions between the X electrodes and the Y electrodes are formed.
- a metal film for example, a silver alloy film
- a resist film is formed in a photolithography step, and the lead lines (LX 1 to LX 5 ) of the X electrodes and the lead lines (LY 1 to LY 6 ) of the Y electrodes are formed by patterning the alloy film.
- the lead lines (LX 1 to LX 5 ) of the X electrodes and the lead lines (LY 1 to LY 6 ) of the Y electrodes are covered with an insulation film, and a first conductive film made of a transparent conductive material (for example, ITO) is formed over the viewer-side surface of the substrate 11 .
- a resist film is formed in a photolithography step, and the fine line portions 2 a of the Y electrodes and the active shield electrode (ASC) are formed by patterning the first conductive film.
- the insulation film 12 which is formed of a negative resist, for example, is formed over the substrate 11 which includes the lead lines (LX 1 to LX 5 ) of the X electrodes, the lead lines (LY 1 to LY 6 ) of the Y electrodes, the fine line portions 2 a of the Y electrodes and the active shield electrode (ASC).
- the contact holes 12 a are formed on portions of the insulation film 12 where the contact holes 12 a are necessary and, thereafter, a second conductive film made of a transparent conductive material (for example, ITO) is formed over the insulation film 12 including the inside of the contact holes 12 a.
- a resist film is formed in a photolithography step, and the fine line portions 1 a and the pad portions 1 b of the X electrodes, the pad portions 2 b of the Y electrodes, and the inspection pads (PY 1 to PY 6 ) are formed by patterning the second conductive film.
- the pad portions 2 b of the Y electrodes which constitute an upper layer are electrically connected with the fine line portions 2 a of the Y electrodes which constitute a lower layer via the contact holes 12 a.
- the fine line portions 1 a of the X electrodes which constitute the upper layer and the fine line portions 2 a of the Y electrodes which constitute the lower layer intersect with each other three-dimensionally.
- the protective film 13 formed of a negative resist is formed over the insulation film 12 which includes the fine line portions 1 a and the pad portions 1 b of the X electrodes, the pad portions 2 b of the Y electrodes and the inspection pads (PY 1 to PY 6 ) in such a manner that a portion of the inspection pads (PY 1 to PY 6 ) is exposed thus providing the structure shown in FIG. 1 and FIG. 2 .
- the lead lines (LX 1 to LX 5 ) of the X electrodes and the lead lines (LY 1 to LY 6 ) of the Y electrodes are connected to respective one-end portions of the X electrodes (X 1 to X 5 ) and the Y electrodes (Y 1 to Y 6 ) via through holes (not shown in the drawing) formed in the insulation film 12 .
- FIG. 3 is a view for explaining a touch panel according to an embodiment 2 of the present invention
- FIG. 4 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line IV-IV in FIG. 3 .
- This embodiment is characterized in that inspection pads (PY 1 to PY 6 ) are formed outside terminal portions (TX 1 to TX 5 , TY 1 to TY 6 ) formed on one side of a substrate where the terminal portions are formed, and inspection-use lead lines (LPY 1 to LPY 6 ) are connected between the inspection pads (PY 1 to PY 6 ) and the other end portions of Y electrodes.
- the inspection-use lead lines (LPY 1 to LPY 6 ) are formed over the same layer over which fine line portions 1 a and pad portions 1 b of X electrodes and pad portions 2 b of the Y electrodes are formed, and the inspection-use lead lines (LPY 1 to LPY 6 ) are formed of a transparent conductive film made of ITO or the like in the same manner as the X electrodes and the Y electrodes. Due to such a constitution, it is unnecessary to perform film forming or working to newly form the inspection pads.
- the inspection-use lead lines (LPY 1 to LPY 6 ) are arranged over an active shield electrode (ASC) thus constituting a two-layered wiring structure together with lead lines (LY 1 to LY 6 ) of the Y electrodes formed of a metal layer.
- a voltage the same as a drive voltage supplied to the Y electrodes (Y 1 to Y 6 ) is supplied to the active shield electrode (ASC). Accordingly, capacitive coupling between the inspection-use lead lines (LPY 1 to LPY 6 ) and the active shield electrode (ASC) can be suppressed thus suppressing the capacitive coupling between the Y electrodes. As a result, a touch panel which exhibits high accuracy in position determination can be realized in the same manner.
- the active shield electrode (ASC) between the inspection-use lead lines (LPY 1 to LPY 6 ) and the lead lines (LY 1 to LY 6 ) of the Y electrodes, the capacitive coupling between the Y electrodes can be suppressed. As a result, a touch panel which exhibits high accuracy in position determination can be realized in the same manner.
- the active shield electrode (ASC) can be formed in the same step where fine line portions 2 a of the Y electrodes which constitute intersecting portions between the X electrodes and the Y electrodes are formed.
- the other end portions of the X electrodes are respectively connected to inspection pads (PX 1 to PX 5 ) which are provided for inspecting the electrical conduction.
- a touch panel in which a disconnection is found in the midst of the connection can be eliminated as a defective product thus realizing a touch panel which exhibits a high yield at the time of manufacturing.
- the inspection pads (PX 1 to PX 5 ) are formed of a transparent conductive film such as ITO in the same manner as the X electrodes and the Y electrodes.
- FIG. 5 is a view for explaining a touch panel according to a modification of the embodiment 1 and the embodiment 2 of the present invention
- FIG. 6 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line VI-VI in FIG. 5
- FIG. 7 is a cross-sectional view of an essential part showing the cross-sectional structure of the touch panel taken along a line VII-VII in FIG. 5 .
- pad portions 1 b of respective X electrodes and pad portions 2 b of respective Y electrodes are arranged without overlapping with each other, and fine line portions 1 a of the respective X electrodes and fine line portions 2 a of the respective Y electrodes intersect with each other.
- the touch panel shown in FIG. 5 to FIG. 7 is characterized in that the X electrodes and the Y electrodes are formed over different layers with an insulation film 12 sandwiched therebetween as shown in FIG. 5 to FIG. 7 , wherein the X electrodes are formed below the Y electrodes and, in the same manner as lead lines of the X electrodes and lead lines of the Y electrodes, the X electrodes are formed over a viewer' s side surface of a glass substrate 11 .
- FIG. 8 is a view for explaining an X electrode of a touch panel according to an embodiment 3 of the present invention.
- This electrostatic-capacitance type touch panel determines presence or non-presence of a finger touch based on a change in capacitance of the X electrode or a Y electrode in response to the finger touch. Sensitivity in such an operation is influenced by capacitances and resistances of the X electrode and the Y electrode per se. That is, when the capacitances are large, it is impossible to grasp the change in capacitance when a user touches the touch panel. When the resistances are large, the electrodes (X electrode and Y electrode) cannot be charged sufficiently and hence, a response value for the finger touch becomes small so that sensitivity is lowered.
- a region where sensitivity is insufficient is formed partially and such a region adversely influences a manipulation.
- a line length of electrodes which are arranged parallel to a long side of the touch panel (X electrodes in this embodiment) is large and hence, there may be a case where a load is increased at a remote end remote from a feeding end thus giving rise to the above-mentioned phenomenon.
- a width of the fine line portion 1 a is increased along with the increase of a distance from the feeding end such that a width of a fine line portion 1 af at the remotest end from the feeding end is set twice or more as large as a width of a fine line portion tan at the nearest end near the feeding end (B ⁇ 2 ⁇ A in FIG. 8 ). Accordingly, the reaction value in response to the finger touch can be made uniform between a remote end side remote from the feeding end and a near end side near the feeding end.
- the width of the fine line portion 1 a is increased along with the increase of the distance from the feeding end such that the width of the fine line portion 1 af at the remotest end from the feeding end is set twice or more as large as the width of the fine line portion tan at the nearest end near the feeding end (B ⁇ 2 ⁇ A in FIG. 8 ) with respect to the fine line portion 1 a of the X electrode.
- a width of the fine line portion 2 a may be increased along with the increase of a distance from a feeding end such that a width of the fine line portion 2 a at the remotest end is set twice as large as a width of the fine line portion 2 a at the nearest end near the feeding end.
- FIG. 9 is a view for explaining an X electrode of a touch panel according to an embodiment 4 of the present invention.
- a size (or an area) of a pad portion 1 bf on a remote end side remotest from the feeding end is set small, and floating electrodes 1 c are added to the pad portion 1 bf.
- a charge time can be shortened and an inter-electrode capacitance can be decreased and hence, a reaction value of the pad portion 1 bf remotest from the feeding end in response to a touch on the X electrode can be enhanced.
- the size (or the area) of the pad portion 1 bf on the remote end side from the feeding end is set small and the floating electrodes 1 c are added to the pad portion 1 bf with respect to the X electrode.
- a size (or an area) of a pad portion 2 b on a remote end side remote from a feeding end may be set small and floating electrodes 1 c maybe added to the pad portion 2 b with respect to a Y electrode.
- the size (or the area) of the pad portion 1 b (or the pad portion 2 b ) on the remote end side remotest from the feeding end is set small and the floating electrodes 1 c are added to the pad portion 1 b (or the pad portion 2 b ) with respect to the X electrode (or the Y electrode) in this embodiment
- a plurality of the pad portions 1 b (or the pad portions 2 b ) on a remote end side remote from the feeding end may be set small and floating electrodes 1 c may be added to the pad portions 1 b (or the pad portions 2 b ) in the X electrode (or the Y electrode).
- the number of the pad portions 1 b (or the pad portions 2 b ) whose size (or area) is decreased and to which the floating electrodes 1 c are added may be set such that a reaction value in response to a finger touch can be made uniform in the X electrode (or the Y electrode). Further, sizes (or areas) of the pad portions 1 b (or pad portions 2 b ) of the X electrode (or the Y electrode) may be gradually decreased along with the increase of a distance from the feeding end, and sizes (or areas) of the floating electrodes 1 c may be gradually increased along with the increase of the distance from the feeding end.
- FIG. 9 shows such a constitution.
- FIG. 10 is a view for explaining a drawback of the touch panel according to the embodiment 3 of the present invention.
- FIG. 11 is a view for explaining an X electrode of a touch panel according to an embodiment 5 of the present invention.
- This embodiment is, as shown in a portion A of FIG. 11 in an enlarged manner, characterized in that the resistance of a fine line portion 1 a of the X electrode remotest from a feeding end is lowered by laminating a metal layer MT to the fine line portion 1 a . Due to such a constitution, compared to the previously-mentioned embodiment 3 shown in FIG. 8 , a line width of the fine line portion 1 a of the X electrode remotest from the feeding end can be made small and hence, it is possible to make the X electrodes and Y electrodes more difficult to be recognized by a user. Further, a size of the X electrode and a size of the Y electrode can be made uniform with each other and hence, linearity of the electrodes can be enhanced.
- the resistance of the fine line portion 1 a of the X electrode remotest from the feeding end is lowered by laminating the metal layer MT to the fine line portion 1 a
- the resistance of a fine line portion 2 a of the Y electrode remotest from a feeding end may be lowered by laminating the metal layer MT to the fine line portion 2 a.
- the resistance of the fine line portion 1 a (or the fine line portion 2 a ) remotest from the feeding end may be lowered by increasing a film thickness of the fine line portion 1 a (or the fine line portion 2 a ) remotest from the feeding end with respect to the X electrode (or the Y electrode). Also in this case, it is possible to make the X electrodes and the Y electrodes more difficult to be recognized by a user. Further, a size of the X electrode and a size of the Y electrode can be made uniform with each other and hence, linearity of the electrodes can be enhanced.
- the metal layer MT is laminated to the fine line portion 1 a (or the fine line portion 2 a ) remotest from the feeding end with respect to the X electrode (or the Y electrode).
- the metal layer MT may be laminated to a plurality of fine line portions 1 a (or fine line portions 2 a ) on a remote end side remote from the feeding end in the X electrode (or the Y electrode).
- the number of the fine line portions 1 a (or the fine line portions 2 a ) to which the metal layer MT is laminated may be set such that a size of the X electrode and a size of the Y electrode become uniform.
- this embodiment is also applicable to a usual touch panel, that is, a touch panel where fine line portions 1 a (or fine line portions 2 a ) of X electrodes (or Y electrodes) have a uniform width.
- FIG. 12 is a view for explaining lead lines of a touch panel according to an embodiment 6 of the present invention.
- this embodiment is characterized in that, lead lines (LX 1 to LX 5 , LY 1 to LY 6 ) are connected to resistances (R 1 ) of 100k ⁇ or more so as to prevent the appearance of irregularities in resistance value among X electrodes or irregularities in resistance value among Y electrodes within an effective touch region thus making a reaction value in response to a touch uniform within the effective touch region. Further, this embodiment can also cope with noises effectively.
- shapes of the pad portion 1 b of the X electrode and the pad portion 2 b of the Y electrode in a peripheral portion of the touch panel are set half of shapes of the pad portions in a center portion.
- the load is increased at the remote end remote from the feeding end.
- the pad portions ( 1 b , 2 b ) of the X electrode and the Y electrode remotest from the feeding end are set half of the pad portions in the center portion in shape and hence, the load is also halved approximately.
- the fine line portions ( 1 a , 2 a ) or the pad portions ( 1 b , 2 b ) to which the above-mentioned embodiments 3 to 5 are applied may be the fine line portions ( 1 a , 2 a ) or the pad portions ( 1 b , 2 b ) preceding to the fine line portions ( 1 a , 2 a ) or the pad portions ( 1 b , 2 b ) of the X electrode and the Y electrode remotest from the feeding end by one.
- the above-mentioned embodiments 3 to 6 are also applicable to a touch panel where the fine line portions 1 a and the pad portions 1 b of the plurality of X electrodes and the pad portions 2 b of the plurality of Y electrodes are formed over the substrate 11 , and the fine line portions 2 a of the plurality of Y electrodes are formed over the insulation film 12 .
- the touch panel of the above-mentioned each embodiment is arranged on a display panel of a liquid crystal display device or an organic EL display device, and is used as a device for inputting information by performing a touch operation on a display screen with a finger of a user, a pen or the like.
Abstract
Description
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US20110261010A1 (en) | 2011-10-27 |
JP2011227793A (en) | 2011-11-10 |
JP5424209B2 (en) | 2014-02-26 |
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